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- W2352624631 abstract "Paclitaxel (PAC) is the first-line chemotherapy drug for most breast cancer patients, but clinical studies showed that some breast cancer patients were insensitive to PAC, which led to chemotherapy failure. It was reported that Notch1 signaling participated in drug resistance of breast cancer. Here, we show whether Notch1 expression is related to PAC sensitivity of breast cancer.We employed Notch1 siRNA and Notch1 inhibitor, N-[N-(3,5-difluorophenacetyl)-1-alanyl]-S-phenylglycine t-butylester (DAPT), to down regulate Notch1 expression in human breast cancer cells MDA-MB-231, and detected the inhibition effect by Western blotting and reverse trans cription-polymerase chain reaction, respectively. After 24 hours exposure to different concentration of PAC (0, 1, 5, 10, 15, 20, and 25 µg/ml), the viability of the control group and experimental group cells was tested by MTT. We also examined the expression of Notch1 in PAC sensitive and nonsensitive breast cancer patients, respectively by immunohistochemistry (IHC). The PAC sensitivity of breast cancer patients were identified by collagen gel droplet embedded culture-drug sensitivity test (CD-DST).Down regulation of Notch1 expression by Notch1siRNA interference or Notch1 inhibitor increased the PAC sensitivity in MDA-MB-231 cells (P < 0.05). Also, the expression of Notch1 in PAC sensitive patients was much lower than that of PAC non-sensitive patients (P < 0.01).Notch1 expression has an effect on PAC sensitivity in breast cancer patients, and the inhibition of Notch1 increases paclitaxel sensitivity to human breast cancer." @default.
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- W2352624631 date "2014-01-01" @default.
- W2352624631 modified "2023-10-16" @default.
- W2352624631 title "Inhibition of Notch1 increases paclitaxel sensitivity to human breast cancer." @default.
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